Scaffold



7 Y J. w., CLIFTON -scAFFoLb Filed Nov. 10,1924 2 Sheets-Sheet 2 )IllllllIlllllllIIIIIIIIIIIIIIIIIML V/l/l/lI/llllllllllllIl/I/s VIII/III,

?atented Aug. 24, 1926.

UNi'liE-fi' S iei'i'ES JAMES WILLIS CLIFTON, OF MACON, GEORGIA.

scasi onn.

Application filed November 10, 1924. Serial No. 748,913.

My invention relates to improvements in scaffolds of the type used in the erection of tall buildings, for the purpose of supporting workmen and building material and raising them as the wall is constructed.

scaffolds of this type generally include scaffold boards laid upon a plurality of transverse metal sills or bars, cable-winding devices mounted on the ends of these sills or bars, cables connected with said winding devices, and beams projecting outwardly from the top of the building, said beams supporting said cables.

One object of the 'inventionfis to provide an improved form of scaffold, in which vertical members rise from the ends of the transverse bars or sills and support horizontal crown bars which in turn are adapted to support a plurality of scaffold boards which protect the workmen against any falling objects, saidlcrown' bars being provided with cable guides through which the scaffold suspending cables pass.

Another object is to provide a unique supporting frame for each cable winding device, including a pair of vertical side members or standards between V which a Windlass extends, and cable guiding means extending between the upper ends of said side members or standards, above the windlass, so that lateral tilting of the frame and the bar or sill to which it is secured, is prevented.

A still further object is to downwardly offset the ends of each transverse bar or sill from the upper plane of its intermediate portion, and to secure bases ofthe windlass-carrying frames to said downwardly offsetend portions, with the upper sides of said bases substantially flush with the upper sides of the bars or sills. Thus, in addition to supporting scaffolding boards upon these bars or sills, between the winlass carrying frames, additional boards may be supported upon the bases of said frames. 7

still further aim of the invention is to provide cable win'difig ineanswhichmay be easily operated by the workmen upon the scaffold, said winding means being of such nature that it will be positively locked in any position at which it may be left.

lVith the foregoing in view, the invention resides in the novel subject matter hereinafter described and claimed, the description being supplemented by the accompanying drawings.

Fig. 2.

fully described;

Figure 1 is an end elevation of a scaffold embodying my improvements.

nligure 2 is an outer side elevation on a reduced scale.

Figure 3 -'s an elevation of one of the Windlass carrying frames" and associated parts, looking in the opposite direction from Figure 4 is avertical sectiona'l view on line l-e of Fig. 3. r

Fig. .5is a detail fragmentary sectional View; taken on the brokenline 5-5 of Fig. 1 looking upwardly in the direction of the arrows and showing one of the cable guides.

ln l ig. 2, number ofsca-ifold'board supporting units U are shown, said uii its supporting upper and lower scaffold boards '13 and i3. Each of the units U 'includes' a transverse metal sill or bar 1, a frame 2 carried by each end of said bar and carryingcablewindmg means, a cable 3 associated with the winding 1116811301? each frame, and a beam d pro3ect1ng outwardly from the building in connection withwhichflthe scaffold is used, said beam supporting the cables 3. Each unit U also embodies a number of novel features of construction hereinafter ft S111 1 is P e b y, although e rily-formed ofchannel metal, and

the end portions 5 of this bar are down- "wardly otiset from-the upper plane ofthe intermediate portion" of said bar, this offsetting being obtained when the' bar is of channel metal, by cutting away the side flanges of said-bar, at its endpor'tions. Zlh'e frames 2 areofU-shape and they have their bases secured upon the end portions 5 of the bar withthe upper sides of saidb-ases in substantially the same llOIdZOlltfll plane with the upper side of the-intermediate p tion of the bar, wher eby said bases'may' be "used to support some of the scaffold boards 13 Each frame 2 is by preference formedol two 'L-sh'apedplates having their base pertions 6 disposed one upon the other, said base portions being secured together and seis a-horizontal shaft 9 carrying a Windlass ltd) 10 which extends between the members 8 and is connected with the lower end of cable 3. At one of its ends, the shaft 9 is provided with a ratchet or locking wheel 11 which co-acts with a dog 12 to assist in locking the shaft and windlass in any posltion at which it may be left, said dog being car ried by said one of the side members 8. The other of these side members carries suitable bearings 13 in which a transverse shaft 14 is rotatably mounted, said shaft having a worm. 15 meshing with a worm wheel 16 which is secured on the end of the shaft 9, remote from the wheel 11. Any adequate provision may of course be made for securing the worm 15 to the shaft 1 1, the worm gear 16 to the shaft 9, the drum 10 to said shaft 9, and the wheel 11 to this shaft. Similarly, any desired provision may be made for rotating the shaft 1 1. i I prefer however to equip it with a hand-wheel 17 which is shown as provided with a lateral handle 18.

Extending between the upper ends of the side members or standards 8, I have shown two rods 19 upon which parallel cable-guiding rollers 20 are mounted. The cable 3 passes between these rollers and extends downwardly therefrom to the Windlass 10, so that the rollers, by engagement with the cable, overcome any liability of the frames 2 and the bar 1, tilting about an axis extending longitudinally of said bar.

An arched frame 21 is provided over each bar 1, said frame including a horizontal crown bar 22 and a pair of legs 23 which may if desired be detachably bolted to said bar 22, as indicated at 24:. The lower end of the legs 23 are bolted at 25 to the outermost of the side members 8, and it will be seen that said side members and legs co-act in forming vertical members to support the crown bar 22. This crown bar is adapted to support the upper scaffolding boards B and the ends of said bar are provided with appropriate cable guides 26 preferably in the form of U-shaped clips which assist in preventing lateral swaying or tilting of the scaffold supporting units U. The boards B and crown bar 22 being provided respec tively with notches a and a opposite the guides to permit the passage of the cables.

By providing the construction shown and described or a substantial equivalent thereof, a scaffold structure is produced which is rather simple and inexpensive, yet is very desirable and reliable, particular attention being directed to the ease with which the windlass 10 may be adjusted by the w-ork men upon the scaffold, to raise or lower the latter as occasion may demand. Obviously, the entire scaffold may be quickly and easily knocked down for transportation from one place to another, and may be again set up with equal ease. I

As excellent results are obtainable from the details disclosed, they are preferably followed, but within the scope of the inven tion as claimed, numerous modifications may be made;

I claim:

1. A scaffold comprising a horizontal bar for transverse disposition under scaffold boards, cable winding means carried by the ends of said bar, vertical members rising from said ends of the bar, a crown bar connected to the upper ends of said vertical members and extending horizontally over the first named bar to support upper scaffold boards, and cable guides carried by the ends of said crown bar, said guides being in the form of U-shaped clips secured to the crown bar, said crown bar being provided with notches opposite said clips to permit the passage of supporting cables.

2. A scaffold comprising a horizontal bar for transverse disposition under scafiold boards, a pair of standards rising from each end of said bar, cablewinding means ineluding a Windlass extending between the lower portions of each pair of standards, an arched frame having the lower ends of its legs secured to the standards at the ends of said first named bar, the crown bar of said frame extending horizontally over said first named bar to support upper scaffold boards, and cable guides carried by the ends of said crown bar, said guides being in the form of U-shaped clips secured to the crown bar, said crown bar being provided with notches opposite said clips to permit the passage of supporting cables.

3. A scaffold comprising a horizontal bar to extend transversely under scaffold boards, a Ushaped frame upon each end of said bar and formed of two L-shaped plates whose base portions are disposed one upon another, bolts passing through said base portions and said bar to secure them together, and cable winding means including a Windlass extending between the vertical portions of said plates.

In testimony whereof I have hereunto affixed my signature.

JAMES WILLIS CLIFTON. 

